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A preparation method of liquid feeding material for plasma spraying nanostructure thermal barrier coating

A technology of thermal barrier coating and nanostructure, applied in the direction of coating, etc., can solve the problems of the decline of physical and mechanical properties of the coating, the growth of nano-powder grains, the growth of nano-grains, etc., and achieve the effect of heat insulation Excellent, reduced operating steps, high transfer efficiency

Inactive Publication Date: 2018-04-03
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only the cost is high, but also the grains of nano-powders grow to varying degrees in different links. Due to the cumulative effect of each process in the process, the grain size of the prepared coating may eventually exceed the range of nanostructures, that is, the grain size exceeds 100nm
Especially in the process of powder sintering densification and plasma spraying, there is a phenomenon of nano-grain growth
Therefore, even if the raw material is nano-powder, the prepared thermal barrier coating is not necessarily nano-structured, resulting in a significant decline in the physical and mechanical properties of the coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] S1, take ScCl 3 6 parts, YbCl 3 2 copies, La 2 Zr 2 o 7 2 parts were respectively dissolved in deionized water to prepare a salt solution with a molar concentration of 0.8mol / L;

[0026] S2. After mixing the three salt solutions obtained evenly, add 0.3 parts of dispersant to obtain a mixed solution;

[0027] S3, adding the obtained mixed solution into pre-prepared ammonia water with a pH value of 10 for chemical co-precipitation reaction, adjusting the pH with concentrated ammonia water to keep the pH value at 10 until no new precipitate is formed, and standing for 24 hours to obtain colloidal coprecipitate;

[0028] S4, wash with deionized water and absolute ethanol respectively and filter colloidal coprecipitate 3 times, remove chloride ion, obtain precipitate;

[0029] S5. Take 2-3 parts of inorganic nanoparticles and disperse them in pure water through an ultrasonic oscillation device to form an inorganic nanoparticle dispersion;

[0030] S6, take ZrO 2 ...

Embodiment 2

[0034] S1, take ScCl 3 8 parts, YbCl 3 3 servings, La 2 Zr 2 o 7 3 parts were respectively dissolved in deionized water to prepare a salt solution with a molar concentration of 1.2 mol / L;

[0035] S2. After mixing the three salt solutions obtained evenly, add 0.5 part of dispersant to obtain a mixed solution;

[0036] S3, adding the obtained mixed solution into pre-prepared ammonia water with a pH value of 11 for chemical co-precipitation reaction, adjusting the pH with concentrated ammonia water to keep the pH value at 11 until no new precipitate is formed, and standing for 48 hours to obtain colloidal coprecipitate;

[0037] S4, wash with deionized water and absolute ethanol respectively and filter colloidal coprecipitate 3-5 times, remove chloride ion, obtain precipitate;

[0038] S5. Take 3 parts of inorganic nanoparticles and disperse them in pure water through an ultrasonic oscillation device to form an inorganic nanoparticle dispersion;

[0039] S6, take ZrO ...

Embodiment 3

[0043] S1, take ScCl 3 7 parts, YbCl 3 2.5 servings, La 2 Zr 2 o 7 2.5 parts were respectively dissolved in deionized water to prepare a salt solution with a molar concentration of 1mol / L;

[0044] S2. After mixing the three salt solutions obtained evenly, add 0.4 part of dispersant to obtain a mixed solution;

[0045] S3. Add the obtained mixed solution to the pre-prepared ammonia water with a pH value of 10.5 for chemical co-precipitation reaction, adjust the pH with concentrated ammonia water to keep the pH value at 10.5, until no new precipitate is formed, and stand for 24-48 hours , to obtain a colloidal co-precipitate;

[0046] S4, wash with deionized water and absolute ethanol respectively and filter colloidal coprecipitate 3-5 times, remove chloride ion, obtain precipitate;

[0047] S5. Take 2-3 parts of inorganic nanoparticles and disperse them in pure water through an ultrasonic oscillation device to form an inorganic nanoparticle dispersion;

[0048] S6, t...

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PUM

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Abstract

The invention discloses a method for preparing liquid feed for plasma spraying nanostructure thermal barrier coatings. ScCl3, YbCl3, La2Zr2O7 are dissolved and mixed, then reacted with ammonia water to prepare colloidal co-precipitates, washed and filtered, and mixed with inorganic nanoparticles Dispersion, ZrO2, Lu2O3, In2O3, Al2O3, nanoparticles, chemical resistance modifiers, heat-resistant agents, flame retardant synergists, brominated flame retardants, and nanoparticles are mixed and placed in a ball mill. The spray gun forms a high-temperature and high-speed plasma jet, and the powder feeding airflow pushes the powder obtained from the ball mill into the plasma jet, and the mixed powder is rapidly heated to a molten or semi-molten state, and is accelerated by the plasma jet to form a beam of sprayed particles flying to the substrate. The particle beam impinges on the pretreated substrate surface to form a thermal barrier coating. The invention has excellent high-temperature phase stability, high-temperature sintering resistance and corrosion resistance.

Description

technical field [0001] The invention relates to the field of preparation of thermal barrier coatings, in particular to a method for preparing liquid feed for plasma spraying nanostructure thermal barrier coatings. Background technique [0002] Thermal barrier coating is to apply low thermal conductivity oxide ceramic material on the surface of metal workpiece in the form of coating to reduce the surface temperature of the workpiece working in high temperature environment, which can not only improve the service life of the workpiece, but also make the current Some metal materials work in a higher temperature environment. Coating thermal barrier coatings on high-temperature parts of aero-engines and ground gas turbines can reduce the surface temperature of metal parts, improve the anti-oxidation and anti-corrosion performance of parts, and greatly extend the service life of metal parts. [0003] Traditional plasma spraying method to prepare nanostructured thermal barrier coat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/61C09D7/63
Inventor 王春杰王月张爱华魏洪峰张志强霍星张华李超李文军
Owner BOHAI UNIV
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